When I saw the video footage of the incident (that appears to have alluded many contributors here in this thread), my reaction was that if I was there, I would likely have removed the attacker from his vehicle at gunpoint and placed him under citizens arrest for assault. And when he resisted, he would have been either shot or badly beaten into submission.
The video clearly shows a premeditated attack on peaceful protestors... not "road rage" or any other euphemistically forgiving categorization of his physical attack with a deadly weapon on peaceful persons.
Premeditation would imply he got into his truck with the intention of running over protesters. "Road rage" implies in the heat of the moment. His attack could have been politically motivated, without being premeditated.
not that it really matters, but it stopped being potential "road rage" when
a) he left the road to intentionally injure the protestors on the sidewalk (who were in the way of the entrance to the parking area, but not on a public road)
b) he paused for a few moments before deciding to continue to threaten them with deadly force
c) he clearly saw the pedestrian protestors and the person recording him, and thoughtfully (meditatively - before taking additional action.. i.e. pre-meditated) decided to take the additional action of lurching the vehicle forward into them.